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This paper focuses on the stability of landing gear systems for quadrotor UAVs. As drones are increasingly deployed across diverse applications including precision agriculture, emergency logistics, and infrastructure inspection, landing gear stability becomes critical to ensuring safe and reliable operation...

The organosilicon-acrylic resin/LDHs nanocomposite was prepared from acrylate, organosilicon Mg-Al-AA-LDHs as well as emulsifier etc with emulsion polymerization methods. The samples prepared were characterized by optical , thermal and gas barrier capabilities testing, Results show the samples were nanocomposion...

Rigid polyurethane foams (RPUFs) were prepared by heteroaromatic polyol as the matrix polyol, methylphosphonate (DMMP) was added to improve its flame retardancy, and the relative performances were studied. Thermal stability were measured by dynamic mechanical analysis (DMA) and thermo gravimetric analysis...

The low-altitude economy is a national strategic emerging industry. UAV is its core application platform, and XR technology helps to improve the low-altitude experience. The current XR drone interaction usually uses the traditional joystick. These controls lead to problems such as immersion interruption,...

The main body of PCOC (Petrochina Changqing Oilfield Company) is in the Ordos Basin, exploration with a total area of about 37 square kilometers, and whose exploration area is highly fragmented. The situation of the pipeline rupture emerge in endlessly as the result of natural conditions and human factors...

Sepiolite as catalyst carrier material, now commonly used in low temperature, for high temperature applications was very rare. ZrO2/sepiolite precursor was prepared by Chemical precipitation method, catalyst coating material was prepared at 600 , the samples were aged at 1000 . The powders with and without...

Quanfeng Lantern Opera (also “Quanfeng Hua Deng”, “全丰花灯”), an important local folk art form of Jiangxi Province, was included in the First National List of Intangible Cultural Heritage of China in 2006 (500IX-52). It has developed a unique performance form and characteristics after long-standing as the...

Clustering is an effective method which can increase the performance of large-scale ad hoc UAV networks. However, the ad hoc UAV networks have the feature of high mobility and quick network topology change, using conventional clustering algorithm will lead to the decrease of link connection lifetime...

A safe and comfortable urban settlement is an area with easy access to public facilities. Research related to improving the quality of urban settlements provides a clear direction for accessibility and infrastructure. The complexity of urban settlement characteristics takes time in collecting data; therefore,...

Because of the strong alkalinity and large amount of heavy metals in red mud, many countries have paid more attention to red mud. According to the traditional treatment method, an innovative scheme is proposed in this paper, which uses red mud (RM), ground granulated blastfurnace slag (GGBS), fly ash...

Autonomous navigation in extreme hazardous environments where human access is impossible remains a critical challenge for unmanned aerial vehicles (UAVs). This paper presents a novel Hierarchical Multi-Agent Deep Reinforcement Learning (HMA-DRL) framework for coordinated UAV swarms capable of exploring...

A covariance shaping adaptive Kalman filtering method is newly presented to improve the positioning accuracy of MIMU/GNSS tightly-coupled integrated navigation system for UAV. A dual channel parallel filter scheme with the adaptive filter is proposed to improve the real-time performance and make the...

Image segmentation is a key problem in several fields of science and technology, for E.g. medicine, robotics, and industrial development. The importance of perceptual grouping and organization in vision possess numerous significant factors, such as similarity, proximity, and good continuation, which...

This paper focus on the design experimentation system of data processing in two camera image, for experimentation of relief stereo mapping and on image processing methods, which base on its composition and dual combination of wide angle digital camera design principles. Practice shows that flight efficiency...

Unmanned Aerial Vehicles (UAVs) have increasingly become vital across a wide range of industries in the past decades. However, the conventional GPS-dependent navigation systems face critical limitations in these applications, especially in GPS-denied environments. Recent advances in Artificial Intelligence...

With the rapid development of computer vision technology, object detection in drone-captured imagery has become a highly important research topic in recent years. This technology is now applied in a wide range of fields, including urban planning, agricultural monitoring, disaster response, traffic management,...

With the rapid development of UAV technology, the digital competence of UAV application technology professional teachers in higher vocational colleges has become a key element of educational reform and development. This paper analyzes the current situation of digital competency of UAV application technology...

Optical imaging reconnaissance plays an important role in the intelligence and reconnaissance process, especially widely used in UAV reconnaissance and direct fire weapons. Combined with related requirements, a simulation model of the optical imaging reconnaissance process is proposed, including the...

Hexagonally ordered mesoporous silica SBA-15 was successfully synthesized for the first time using natural clay from low-grade potash ores of a salt lake in Qinghai, China, without addition of silica reagents. The influence of changes in processing parameters, such as activation method, hydrothermal...

The influence of curing temperature on the deformation properties of magnesium oxide(MgO) micro-expansive concrete were studied.Hydration mechanism and expansion characteristics of magnesium oxide(MgO) in cement paste were analyzed by XRD DSC-TG and SEM. Results indicated.Curing temperature had a great...

With the rapid change of UAV technology, micro multi rotor UAV models are constantly updated and iterated, and the methods and means of flight training are also upgraded and improved. The number of tasks for training micro multi rotor UAV operators is increasing, and the training standards are constantly...

According to the kinematics and dynamics characteristic of UAV Two-axis Pan-title, the dynamic equations of two-axis platform was erected up, and moreover by predigesting and linearizing the model in the balance point, the math model was gained which could be the same with Fault-tolerant controller design....

Rotor UAV is a small, lightweight and low-cost unmanned vehicles. In recent years ,it has been widely used in production and daily life. With the rotor unmanned aerial vehicles more and more appear in people's work and life, UAV flight safety issues have become a concern. Many researches on controllability...

Unmanned Aerial Vehicle (UAV) has many uses, including aerial photography, aerial mapping and monitoring activities. Quadcopter is a type of UAV that uses four rotors. The speed of each rotor has a considerable influence on the movement. The quadcopter movement can be done in this research, namely the...

With the development of automatic control technology, quadcopter UAVs based on PID controllers are widely used in many fields such as exploration, aerial photography, monitoring patrols, etc. Due to the fact that the controlled object has a certain nonlinearity in complex environments, there exists the...

This paper puts forward a kind of unmanned aerial vehicle (UAV) control method for longitudinal dynamics. Which includes velocity loop (inner loop) and height loop (outer loop). Multi-model adaptive control is used to control the velocity of UAV in the inner loop. The construction of model set and switching...

The pseudospectral method is one of the most effective methods to optimize the trajectory of UAV, however, the initial guess of the initial state is mainly based on the engineer's engineering experience, lacking of actual data support. Based on h-p adaptive pseudospectral method, this paper takes fuel...

The motor drive system is a servo mechanism to control the four rotor UAV (unmanned aerial vehicle) system, and it is also a key component to control the attitude and trajectory of UAV. Its performance directly affects the performance and safety of the flight control system. The working principle of...

With the rapid development of Unmanned Aerial Vehicles (UAV) technology, their applications in agricultural monitoring, search and rescue, environmental monitoring and other fields are increasing. These application scenarios put forward higher requirements for the autonomous navigation and path planning...

The Fe doped TiO2 (FET) gels were synthesized by different ferric salts and analyzed by thermal gravimetric analyzer and X-ray diffraction. The TG curves show that the valence states of Fe had a great influence on the preparation of FET gels, Fe3+ was easy to replace titanium atoms to form lattice and...

Urban air mobility (UAM) will place automated aircraft, low-altitude corridors, vertiports, data platforms and urban communities in a tightly coupled operating environment. To support proactive low-altitude safety governance, this paper develops a perceived-risk assessment framework combining the analytic...

Traditional mosaic methods of unmanned aerial vehicle (UAV) need ground control points, which are difficult to implement in the emergency situation. A new image mosaic method on small unmanned aerial vehicle is proposed. The method uses the Harris algorithm to extract the feature points and refines them...

Based on the gradual popularization of UAV and the development trend of UAV application, the application of UAV sensors for target recognition and information fusion analysis has become one of the key topics of today’s research. Researchers have made progress in UAV target recognition by adopting wireless...

Complex of cell-THPC-thiourea-ADP with lanthanide metal ions Gd3+ has been prepared. The thermal stability and smoke suspension of the samples are determined by TG, DTA and cone calorimetry. Experimental data show that for the complexes of cell-THPC-thiourea-ADP with the metal ions, thermal decomposition...

Potassium perfluorobutane sulfonate (PPFBS) was used to impart flame retardancy to polycarbonate (PC). The thermal properties of of the PC/PPFBS composites were studied by limiting oxygen index (LOI), vertical burning test (UL-94), TG, and scanning electron microscopy (SEM). The results showed that PC/1wt.%...

In recent years, with the development of economy and science and technology, establishing a more intelligent transportation system is an effective way to solve the frequent traffic problems. Drones are widely used in intelligent transportation because of their compactness and flexibility, wide aerial...

Data on the number of palm oil tree plantations on cultivated land is essential in a company's cultivation activities. Limitations of collecting data number of palm oil trees using the terrestrial method are the effectiveness of times, in terms of costs, and coverage area. Utilization of remote...

With the maturity of drone technology and its increasing application in agriculture, logistics, and even medical fields, the issue of its flight safety in low-altitude complex environments has become increasingly critical. Autonomous flight obstacle avoidance is the core technology to ensure the reliability...

UAVs are increasingly used in these emergencies, delivering supplies or assessing damage [2]. But there’s a catch: most of them still rely a lot on GPS to get around [1]. If the satellite signal cuts out or gets weak—and it happens, especially if you’re only using one system—those UAVs can’t always finish...

TG/DTG was applied to study the overall kinetics for the reduction of pyrolusite by the mixture of cellulose and lignin, two major components of biomass. The respective reduction processes can be described by a new empirical equation based on the JMA equation, and the apparent activation energy is 38.66...

The main work of this thesis is to study and discuss flame retardant properties of the flexible polyurethane foam (FPUF) added with borax as flame retardant. The flammability parameters, including limiting oxygen index(LOI), rate of heat release (RHR), total heat release (THR), total mass loss (TML)...

As their application scenarios become more diverse, the demand for control methods that can resist interference is also growing. This is particularly important for UAVs operating in some scene happened in complex environments, where they may be susceptible to various external interference factors, such...

Montmorillonite as flame retardant was used to flexible poly (vinyl chloride) (PVC), and the flame retardant and smoke suppressant properties of PVC were investigated by the limiting oxygen index, smoke density rating, and cone calorimeter tests (CONE), the thermal degradation behaviors of PVC were studied...

UAV propeller geometry type surface is more complex, in this paper, on the basis of previous preliminary design of the UAV propeller based model calculation results, the use of computer information technology means of propeller geometry model was built first, which contains some practical experience...

General Background: Digital forensic acquisition on Unmanned Aerial Vehicles (UAVs) is essential to ensure the integrity and admissibility of digital evidence in forensic investigations. Specific Background: Two primary acquisition approaches, namely dynamic physical acquisition and static physical acquisition,...

This paper delves into the design and performance analysis of unmanned aerial vehicle (UAV) communication networks, aiming to provide a comprehensive understanding of the subject. It begins with an introduction to the significance and background of UAV communication networks, followed by a detailed discussion...

Quadcopter Unmanned Aerial Vehicles (UAVs) have seen widespread use in many industries recent years because of their versatility and efficiency in various applications. Integral components of the flight control system, such as PID (Proportional-Integral-Derivative) control and SMC (Sliding Mode Control)...

In order to improve UAV's operational efficiency and survival probability, the optimal path of an UAV should be designed before the UAV performs a mission. This paper applies UAV's constrained conditions to the search strategies of ant colony and use a new evaluation method of path's cost. The algorithm's...

Multi-UAVs close formation is the hot spot of current research. UWB (ultra-wide band) is very feasible to be applied to UAV relative positioning. In this paper, we propose to apply UWB technology to UAV relative positioning for multiple UAV close formations and consider combining UWB positioning with...

With the progress and development of modern science and technology, people’s productivity and work efficiency in agriculture has been constantly improving. One reason for this is the use of drones. Over the years, people have been optimizing the various structures of drones to ensure that they can better...